Multipolar lead parts having plural leads and a retaining member, wherein the retaining member includes a cylindrical portion so as to cover peripheries of the leads, the cylindrical portion facing in a board direction; wherein the leads each include an upper-side board coupling portion and a lower-side board coupling portion; wherein the lower-side board coupling portion comprises a forward protruding portion that the other end side of each of the leads is bent in a direction orthogonal to an arrangement face of the leads, a vertical portion extending downward from a front end, a solder coupling portion extending backward from a lower end, and a rising portion extending upward from the solder coupling portion; and wherein said rising portion is formed as to have an obtuse angle from said solder coupling portion regardless of a bending angle of said vertical portion with respect to said solder coupling portion.